Data assimilation with variational and ensemble methods. I have been developing a 3DVAR ocean data assimilation system for sigma- and z-coordinate ocean models with my group. Recently a ensemble-based ocean data assimilation have been developed for hybrid-coordinate ocean model (HYCOM) and for ROMS. These data assimilation systems have been used by other national and international users.

El Nino forecasting using fully coupled and intermediate coupled models. Using fully coupled climate models and an intermediate coupled model, ensemble ENSO forecast systems have been developed with coupled data assimilation schemes. The forecast systems yield high scores from both long-term hindcast experiments and real-time forecasts of recent years. ENSO forecast systems has been transferred to several national operational centers.

Development of operational marine forecasting system. Based on our modeling and data assimilation systems we have been developed pre-operational marine forecast systems for Indian Ocean, South China Sea and coastal seas around China. These systems have been transferred to various operational forecast centers, including National Marine Environmental Forecast Center of China.

Atmospheric Chemistry data assimilation. Due to recent problem of heavy air pollution in China, I have being collaborated with my colleges in air quality modeling and developed anatmospheric chemistry data assimilation system for air quality forecasting and emission inversion.

Honors:

Distinguished Young Scientist Fund by National Science Foundation of China (2002);

Fu W. and J. Zhu: 2011: Effects of sea level data assimilation by the EnOI and 3DVAR on the Variability in an equatorial tropical Pacific model. Journal of Atmospheric and Oceanic Technology. In press.

Zhang Tianyi, J. Zhu, Yang Xiaoguang, Zhang Xiaoyu 2008: Correlations changes between rice yield in the North and Northwest China and ENSO during the period of 1960–2004, Agr. Forest. Meteorol., doi:10.1016/j.agrformet.2008.01.018

Zhang T., J. Zhu, X. Yang, X. Zhang, 2008: Correlations changes between rice yield in the North and Northwest China and ENSO during the period of 1960–2004, Agr. Forest. Meteorol., doi:10.1016/j.agrformet.2008.01.018.